package com.study.ojcodesandbox.utils;

import cn.hutool.core.util.StrUtil;
import com.study.ojcodesandbox.model.ExecuteMessage;
import io.netty.util.internal.StringUtil;
import org.apache.commons.lang3.StringUtils;
import org.springframework.util.StopWatch;

import java.io.*;
import java.util.ArrayList;
import java.util.List;

/**
 * 进程工具类
 */
public class ProcessUtils {
    /**
     * 执行进程获取信息
     *
     * @param runProcess
     * @param opName
     * @return
     */
    public static ExecuteMessage runProcessAndGetMessage(Process runProcess, String opName) {
        ExecuteMessage executeMessage = new ExecuteMessage();

        //等待程序执行，获取错误码
        try {
            StopWatch stopWatch = new StopWatch();
            stopWatch.start();
            int exitValue = runProcess.waitFor();
            executeMessage.setExitValue(exitValue);
            if (exitValue == 0) {
                System.out.println(opName + "成功");
                //分批获取进程的正常输出
                BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(runProcess.getInputStream()));
                List<String> outputStrList = new ArrayList<>();
                //逐行读取
                String compileOuputLine;
                while ((compileOuputLine = bufferedReader.readLine()) != null) {
                    outputStrList.add(compileOuputLine);
                }
                executeMessage.setMessage(StringUtils.join(outputStrList, "\n"));
            } else {
                //异常退出
                System.out.println(opName + "失败，错误码:" + exitValue);
                //分批获取进程的正常输出
                BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(runProcess.getInputStream()));

                List<String> outputStrList = new ArrayList<>();
                //逐行读取
                String compileOuputLine;
                while ((compileOuputLine = bufferedReader.readLine()) != null) {
                    outputStrList.add(compileOuputLine);
                }
                executeMessage.setMessage(StringUtils.join(outputStrList, "\n"));
                //分批获取进程的错误输出
                BufferedReader errorBufferedReader = new BufferedReader(new InputStreamReader(runProcess.getErrorStream()));
                //逐行读取
                List<String> errorOutputStrList = new ArrayList<>();
                String errorCompileOuputLine;
                while ((errorCompileOuputLine = errorBufferedReader.readLine()) != null) {
                    errorOutputStrList.add(errorCompileOuputLine);
                }
                executeMessage.setErrorMessage(StringUtils.join(outputStrList, "\n"));
            }
            stopWatch.stop();
            executeMessage.setTime(stopWatch.getLastTaskTimeMillis());
        } catch (Exception e) {
            e.printStackTrace();
        }
        return executeMessage;
    }


    public static ExecuteMessage runInteractProcessAndGetMessage(Process runProcess, String args) {
        ExecuteMessage executeMessage = new ExecuteMessage();
        //等待程序执行，获取错误码
        try {
            //向控制台输入程序
            InputStream inputStream = runProcess.getInputStream();
            OutputStream outputStream = runProcess.getOutputStream();
            OutputStreamWriter outputStreamWriter = new OutputStreamWriter(outputStream);
            String[] s = args.split(" ");
            String join = StrUtil.join("/n", s) + "/n";
            outputStreamWriter.write(join);
            //相当于按下回车，执行输入和发送
            outputStreamWriter.flush();
            //分批获取进程的正常输出
            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
            StringBuilder compileOutputStringBuilder = new StringBuilder();
            //逐行读取
            String compileOuputLine;
            while ((compileOuputLine = bufferedReader.readLine()) != null) {
                compileOutputStringBuilder.append(compileOuputLine).append("\n");
            }
            executeMessage.setMessage(compileOutputStringBuilder.toString());
            //资源回收
            outputStreamWriter.close();
            outputStream.close();
            inputStream.close();
            runProcess.destroy();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return executeMessage;
    }
}
